Range



W. A. BUSIEK Feb 25, 1936.

RANGE Filed April 27, 1934 4 Sheets-Sheet 2 Feb. 25, 19%. W, A, BU IEKzmzms RANGE Filed April 27, 1954 4 Sheets-Sheet 3 a x a III PatentedFeb. 25, 1936 PATENT OFFICE RANGE William A. Busiek, Belleville, Ill.,assignor to Alphonse E. Fellner, Belleville, 111.

Application April 27, 1934, Serial N0. 722,666

3 Claims.

The object of my invention is to devise a combination gas and coal rangeof the small or bungalow type. In ranges of this type heretofore madethe baking process could be accomplished in the 5 oven when gas was usedas fuel, but could not be accomplished when coal alone was used as fuel.In other words in ranges of this type, the coal portion merely acted toheat the room in-which the range was placed and to heat the plates abovethe coal portion of the range. With the type of construction hereinemployed with few and simple parts that lend themselves readily tomultiple production, not only can baking be accomplished by the use ofcoal, but the baking can be perfectly done on different grids or shelvesin the oven simultaneously.

In the ranges of conventional structure the heat circulation in the ovenis such that the baking operation can be successfully accomplished onlyin a definite predetermined position in the oven. At other positions inthe oven, the temperature is too great and at other positions notsufficiently great to produce uniform baked portions. With the deviceherein described, the baking operation may be accomplished, on any ofthe grids or shelves, because the heat from the products of combustionis compelled to travel beneath and over each grid or shelf maintainingthe same temperature above and beneath each grid.

In the conventional range there are complications which attend theadjustment of the range from coal burning to gas burning that cause manydifliculties and prevent the successful operation by the ordinaryhousewife. She is required, in

order to change from coal to gas to move several levers or dampers, someof which are inconveniently positioned and if she falls in the properpositioning of any one of these controls, the circulation system for theproducts of combustion from the gas will be so distorted that the bakingoperation is impossible. Usually the fact that the controls have notbeen properly positioned is determined after the unsuccessful bakingoperation. By the structure herein described, there is but one controlto change the range from coal burning to gas burning. This is a simpleconveniently placed handle, near the top of the range. By rotation ofthis handle, all the controls are governed.

The circulation of the products of combustion from either the coal orgas fuel is such that when the products of combustion are finallyconducted from the range they will be at a relatively low 55temperature. In other words by means of the circulatory system of theproducts of combustion the stack temperatures are so reduced that themaximum amount of heat from the products of combustion is extractedduring the flow of the products of combustion through the range and may,therefore, be used and is used for the heating operation, for cookingand baking. This economy in heat is reflected in a reduced fuelconsumption, either in the coal or gas operation. This economy in heatoperation is further accomplished by means of a specially designedburner, which will function efficiently with a lesser number of gasorifices than will the ordinary burner and still produce the amount ofheat required for effective operation of the range. In fact the numberof gas orifices may be reduced from the usual number of approximately160 to 90, and since the gas pressure remains the same the amount ofdecrease in gas consumption is represented by the ratio between thenumber of orifices. In addition to the circulation system and the designof the burner, fuel economy is effected by the positioning of theburner, so that each row of orifices will be at the bottom of a separateand distinct flue, so that the products of combustion from each row oforifices will pass through the flue designed therefor. This enables theproper directioning of the several paths of the products of combustionin such a way that while one is passing under a grid or shelf another ispassing over that same grid and beneath and adjacent other grids. Thecombustion is further controlled for efficient heat production by meansof primary and secondary air inlet vents. The control of these vents ismechanically accomplished by means of the same lever that is used toadjust the range from a coal to a gas burner or vice versa. By thestructure herein designed the gas manifold is concealed. Theconventional heat regulator is also attached. The specific method ofopening and closing vents from the unit control is believed to presentdistinct novelty. The oven is set for baking automatically when the gasis turned on. The burner 53 is ignited in the conventional manner.

With these and other objects in view my in vention has relation tocertain novel features of construction and arrangement of parts as willbe hereinafter more fully described, pointed out in the claims andillustrated in the drawings, in which Fig. l is a front elevation of therange.

Fig. 2 is a. sectional plan view on the line 2-2 of Figs. 1 and 5.

Fig. 3 is a fragmental sectional plan view on the line 33 of Figs. 1 and5.

Fig. 4 is a transverse sectional elevation on the line 44 of Figs. 1 and5 with the racks or shelves omitted.

Fig. 5 is a sectional elevation on the line 55 of Fig. 2.

Fig. 6 is an enlarged vertical section elevation, approximately on theline 6-6 of Fig. 2.

Fig. '7 is an enlarged fragmental sectional plan view on the line 'll ofFig. 6.

Fig. 8 is a fragmental sectional elevation on the line 88 of Fig. 5.

Fig. 9 is an enlarged fragmental sectional elevation of the lower leftand lower right corners of the oven, being the same views as shown inFig. 5 enlarged with the racks omitted, and dampers open.

Fig. 10 is a bottom plan view of the deflector plate positioned in thecenter of the left side of the oven.

Fig. 11 is a perspective view showing the connection between the damperbars in the rear right hand corner of the oven.

Fig. 12 is an enlarged plan view of the gas bumer, and r Fig. 13 is anenlarged transverse sectional elevation taken on the line |3|3 of Fig.12.

Fig. 14 is a perspective View of the lower or secondary air damper.

Fig. 15 is a perspective view of the deflector plate, which extendsrearwardly from the front wall and over the, neck of the burner toapproximately the first burner orifice.

Fig. 16 is a lower edge view of the deflector, which separates theproducts of combustion in their passage from the first and secondchannel of the gas burner, reading from right to left in the drawings,which show the burner in combination with other range construction.

In Fig. 5 the path of the products of combustion from the coal fire boxthrough the range to the stack is shown by full line arrows and the pathof the products of combustion from the gas burner through the oven tothe stack is shown by broken line arrows.

Numeral I! designates the frame of the range, which is supported on thefour legs 88.. The frame comprises the bottom l9 and the top 26. Numeral2| designates the left wall and numeral 22 the right wall and numeral 23the rear wall of the frame ll. Numeral 24 designates the front wall towhich are secured the oven door 25 and the ash and coal door 26, in theconventional hinged manner (not shown). The hinges for the oven door areat the bottom and for the ash and coal door at the left.

Numeral 21 designates a glazed opening in the front wall 24 to make thegas flame externally visible and numeral 28 designates a cleanout doorfor the flue, whereby soot etc. can be removed. Numeral 29 designatesthe handle for the ash and coal door 26 and numeral 30 the handle forthe oven door 25.

Numeral 3! designates the conventional thermometer positioned centrallyin the oven door 25. Numeral 32 designates the splash panel secured tothe rear wall 23 of the frame ll at the rear flat top 26. Numeral 33designates the heat control device, which is visible through the upperportion of the front wall 24 centrally.

Numeral 34 designates a separating wall between the gas and coalportions of the range. The separating wall 34 is vertically positionedand connected to the top 20, the bottom l9,

the rear wall 23 and the front wall 24. Numeral 35 designates an openingin the upper portion of the separating wall 34 extending substantiallyfrom front to rear of the range. Numeral 36 designates the fire boxhaving its walls lined with fire walls 31. The fire box 36 is positionedin the upper portion of the frame H to the left of the separating wall34. Beneath the fire box 36 is positioned the ash pan 38 and between thefire box 36 and ash pan 38 are positioned the shaker grates 39.

Over the fire box in the top 20 are positioned gravitationally theplates 46, which cover the conventional coal holes for access to thefire box 36 through the top 26. Over the portion of the frame I! to theright of the separating wall 34 in the top 20 and integral therewith areformed the plates 4| and 42, in which are gravitationally detachablypositioned the gas grids 43. Numeral 44 designates a substantiallyhorizontal plate secured to the right wall 22, to the front Wall 24, andto the rear wall 23. Intermediate its length a substantial distance fromthe left of its center it slopes at an angle upwardly to meet the Wall34 to which it is attached above the slot 35.

Numeral 45 designates the oven, which is conformed by the top 46, theside wall 4! and the floor plate 46. The top 46 is in spacedrelationship with the horizontal plate 44 forming the flue 49. The sidewall 41 is in spaced relationship with the right wall 22 forming theflue 5B. The floor plate 48 is in spaced relationship with the bottom l9forming the flue 5|. The top 46, the side wall 4'! and the floor plate48 are secured to the front wall 24 and the rear wall 23. The top 46 andthe floor plate 48 are in horizontal planes and side wall 47 is in avertical plane. The left end of the top 46 is bent at an angledownwardly and its end is secured to the separating wall 34. The leftend of the floor plate 48 is bent downwardly at right angles to the mainportion and its end is joined to the bottom IS in spaced relationshipwith and parallel to the separating wall 34. By the construction, abovedescribed, the burner space 52 in which is positioned the gas burner 53is formed. In the side wall 41 of the oven 45 is formed the rectangularslot 54. To the side wall 41 of the oven 45 is formed the rectangularslot 54. To the side wall 47, above the rectangular slot 54 is attachedthe separating plate 55 by means of the bolts 56 in such a manner thatthe larger part of the separating plate is suspended vertically in theflue 56 in spaced relationship with the side wall 41 and the right wall22 over the rectangular slot 54. The lower end of the separating plate55 terminates in the horizontal plane of the floor plate 43. Numerals 51designate brackets secured to the side wall 41 in order to support thegrids or shelves 58 and 59 respectively selectively.

Numerals 66 designate a baille vertically positioned between the floorplate 48 and the bottom I9. The bafile wall 60 is secured at one end tothe rear wall 23, and terminates a short distance from the front wall24, forming an opening or space 64 between said front wall and theforward edge of the baffle wall 66. (See Fig. 3.) Numeral 62 designatesthe stack for the products of combustion from both the coal and the gassources of combustion. The stack 62 is a flue secured vertically to therear wall 23 and at its bottom is in fluid communication with the flue 5I, through an opening 5|a formed in the rear wall of flue 5|. To theupper end of the stack 62 may be secured a smoke stack (not shown) thelower end of the stack 62 is blocked with an integral angular platesecured to the rear wall 23. In the stack 62 may be positioned aconventional damper 63.

The products of combustion from the coal fuel may be traced from thefire box 36 through the slot 35, the flue 49, the flue 50 to the rightof the separating plate 55 through the right hand side of the flue 5iand around the opening 64 (see Fig. 3) through the left hand side offlue 5|, and into the flue 6 I into the stack 62 and out through thesmoke stack. It will be seen that by this circulation the products ofcombustion will be forced to pass completely around the top side andaround the bottom of the oven 45. In order to prevent these products ofcombustion from passing around the lower end of the separating plate 55and then upwardly between the separating plate 55 and the side wall 4!through the rectangular slot 54, in the side wall 41, a sliding plate 65is provided, which is placed in sliding engagement over the rectangularslot 54 on the inside of the side wall 41. The sliding plate 55 is invertical sliding engagement with the inner face of a bracket secured tothe wall 47, which bracket has an opening corresponding to the opening54 in the side wall. The sliding plate 65 must remain in its lowerposition when coal is used as a fuel for the reason previouslydescribed, but it must be in its upper or open position when the gasburner is used for the source of heat. This sliding plate 65 could beactuated by a conventional device, exterior to the right wall 22 nearits bottom, but this is inconvenient and impractical. It is obviouslynecessary that the sliding plate 65 be closed when coal is used as afuel. If it is not closed under such a condition, the products ofcombustion from the coal, including the smoke and soot, will passthrough the rectangular slot 54 into the oven 45. Where such a damper ispositioned in the conventional structure, and through lack of knowledgeor accident, it is left open when coal is used, the entire bakingoperation in the oven is practically destroyed.

. In the construction, herein described, it is aimed to make such afatal mistake impossible. It must be remembered that both the gas fueland the coal fuel are not used simultaneously in a structure of the typeherein described. It is understood that the entire change from burningcoal to gas may be accomplished in the structure herein described by thesimple partial rotation of the handle 56, which is conventionallypositioned. The action of the sliding plate 65 is only one of thefunctions to be performed by the partial rotation of the handle 66, aswill be subsequently described. As best shown in Fig. 8, the slidingplate 65 is formed on the lever 61 at its free outer forward end. Thelever B! is pivotally mounted on a bracket 68, which in turn is securedhorizontally to the side wall 41 by the bolts 56. As mentioned above, aslot 68a. identical with slot 54 is formed in the bracket 68. Thefulcrum of the lever 61 is at the pivot 69. The pivot 69 is positionednear the lower rear right portion of the plate 68. The short arm 10 ofthe lever 61 may be moved vertically up and down. The sliding plate 65is of such shape and size that when the lever B! is in its horizontalposition (that shown in solid line in Fig. 8), the sliding plate coversthe rectangular slot 54 but when the lever 61 is oscillated to theposition shown in dash line in Fig. 8, the rectangular slot 54 ispartially or entirely uncovered. In order to act as a guide and as anupper and lower stop for the movement of the free end of the lever 61and hence the sliding plate 65, the guide H is provided, which issecured to the plate 68 at its ends, so that the portion between theends is in spaced relationship with the plate 68, and so that the end ofthe lever 61 and the sliding plate 65 may move arcuately between theguide H and the plate 68. The short arm 10 has the hook '12 formedtherein for engagement in the notch 13 of the rocker arm 14, which ispivotally secured to the rear wall 23 of the oven 45, by means of thepivot 15. The rocker arm 74 may thereby be pivoted or oscillated aroundthe pivot 15 by moving the'short arm 16 of the rocker arm '14vertically. It will be seen that by the structure thus far described thevertical movement of the short arm 16 will move the lever El and hencethe sliding plate 65 vertically and arcuately. The movement of the leverBl is, therefore, by the construction described controlled by themovement of the short arm 10, which is at the lower rear left corner ofthe oven. The pivot 15 is secured to the rear wall 23 of the oven. It isto be understood that obviously the means for actuating the damper plate65 may not pass directly through the oven, which accounts for the factthat the actuating device must be secured to the walls of the oven andpass around its rear corners. To

the short arm 16, near its extreme left end, is secured the rod H, whichpasses vertically downwardly at the rear of the pocket 52. Beforedescribing the further means for the movement of the rod 11, it becomesnecessary to describe the remainder of the oven construction.

Numeral l8 designates a vertical plate in spaced relationship with theseparating wall 34. The vertical plate 78 does not extend to the bottomI9, but terminates midway between the two left channels of the gasburner 53. The upper edge of the vertical plate 18 is bent inwardly andin spaced relationship with the top 46, leaving the space 19 between thetop of the bent portion of the vertical plate 18 and the top 46. On theinner edges of the vertical plate 18 is formed a support for the grid58. The products of combustion from the left channel of the gas burner53 pass upwardly between the vertical plate 18 and the separating wall34 and to the right between the top 46 and the upper grid 18. Theseproducts of combustion are then turned by the top 46 and the side wall41 in their directional movement downwardly through the upper grid 58.As shown in Figs. 3, 4 and 9, the plate 18 is provided with end walls18a bent at right angles thereto, and is welded or otherwise secured toanother plate about to be described.

Numeral 80 designates a separating plate in spaced relationship with thevertical plate 18 and joined to the front wall 24 and the rear wall 23,by screws 8|. The separating plate 80 together with the plate 18 form asmall flue 82, extending from the burner to about the horizontal centerof the oven. In the lower portion of the plate 80 is formed a pocket 83,for a purpose to be described. The extreme lower end of plate 80 is bentat an angle to the left so that its extremity lies midway between thefirst and second channels of the burner.

It will be seen that by this structure the products of combustion fromthe middle portion of the gas burner 53 pass upwardly through the smallflue 82 between the separating plate 80 and the vertical plate 18, overthe top edge of the separating plate 80 and beneath the upper grid 58into the space 84 and from there in contact with the side wall 41 andmixing with the products of combustion from the space I9, which havepassed through the grid 58.

It will likewise be seen that the right portion of the gas burner 53 ispositioned between the left wall of the flue 5I and the lower portion ofthe separating plate 80 forming a short flue 85. The products ofcombustion from this portion of the gas burner 53 pass through this flue85 into the oven beneath the lower grid 59 and through the grid 59 theremeeting the products of combustion from the space I9 and 84 and then ifthe sliding plate 65 is open pass through the rectangular slot 69a and54 between the separating plate 55 and the side wall 41 downwardly intothe flue 5| through the opening 5Ia, into the stack 62 to the smokestack (not shown). It becomes evident that the path of the products ofcombustion from both the gas and coal are the same from the lower righthand corner of the range.

In order to cause the products of combustion to flow laterally to theright and under the lower grid 59 upon leaving the flue 85, rather thanupwardly, a deflector plate 86, a bottom plan View of which appears inFig. 10, is positioned above this flue. The deflector plate 96 is formedof insulation material covered with metal, and is A hingedly connectedto the plate 89 as at numeral 81. Fixed to the under side of thisdeflector plate at the front and rear ends thereof are two angles 88,which serve as supports when the deflector plate is positionedhorizontally on the floor plate 48, i. e. when gas is used. When coal isused, the plate 86 is swung upwardly, as shown by broken lines in Fig,9, and rests within a pocket 89 formed in the plate 89. The purpose ofthe pocket 83 referred to above is to accommodate a channel 99 fixed tothe plate 86. The channel 99 serves as the left hand support for thelower grid 59. When coal is the fuel, and the deflector plate '86 is inits raised position, notches 9I, cut in the angles 98, support the grid59 at the left side thereof. The upper surface of the channel 99, whenthe deflector plate is horizontal, and likewise the notches 9I, when theplate is in its elevated position, are in the same horizontal plane asthe lower right hand grid support 51.

In order to direct the products of combustion from the flue into allportions of the oven under the grid 59, a series of ribs or beads 92 areformed on the bottom side of the deflector plate 36. As shown by thearrows in Fig. 10, the ribs 92 direct some of these products to the rearright hand corner of the oven, others to the front right hand corner,while some pass directly across the central lower portion of the oven tomeet those from the spaces I9 and 84 before passing out of the opening54.

It is evident that the sliding plate 65 must be in its open positionwhen gas is used as a fuel, otherwise the products of combustion willfind no exit from the oven 45. It is, therefore, seen that it isabsolutely essential that the sliding plate 65 be in the proper positionin the case of both the gas and the coal fuel. It is also observed inFig. 5 that the rocker arm I4 slides vertically in a guide 93 secured tothe rear wall 23.

The specific construction of the gas burner 53 is best shown in Figs. 12and 13. It consists of a single casting having the large forward tubularportion 94 to which are integrally joined the three tubes 95, formed soas to establish fluid communication between each of the tubes and theremaining tubes. In the upper surfaces of the tubes 95 are formed theorifices 96, which in the instance of the two left tubes are vertical,but which in the right tube are at an angle of ap proximately forty-fivedegrees extending to the right. This latter feature is to cause theflame from the right most tube to extend at an angle of forty-fivedegrees rather than vertically upwardly so that the flame will beprojected toward the deflector plate 86, at the upper end of the shortflue 85.

Numeral 91 designates the conventional gas pipe inlet. Numeral 98 thegas manifold and numerals 99 the gas valves and numeral I99 the pipesleading from the gas valves 99 to the bumers (not shown). The burnersand the pipes I99 and the gas manifold 98 are positioned in the spacebetween the horizontal top plate and the horizontal plate 44 in theconventional manner in operative position relative to the gas grids 43.The gas pipe inlet 99 passes from the rear of the range to the front ofthe range in a space between the right wall 22 and the horizontal plate44 and the plate 42. Numeral I9I designates a vertical wall connectingthe plate 42 and the horizontal plate 44 in spaced relationship with theright wall 22 and connected tothe front wall 24 and the rear wall 23.Numerals I02 designate the gas valve handles, which extend from the gasmanifold 98 through the front wall 24. The gas burners are operated bymeans of the handles I92, the latter being the only portions of the gasburners protruding beyond the front wall 24 of the burner.

The dial and knob for operating the oven telnperature regulator areseated in a pocket and as mentioned are in view of and accessible to theoperator. As shown particularly in Fig. 6, gas from the manifold 98enters a valve I93, formed in the regulator, by means of pipe I04. Fromthe regulator the gas is supplied to the burner 53 by means of pipesI95, whenever the handle 66 is moved to operate the valve I93. Handle 66is secured on the stem I96 of valve I93 in the conventional manner.

Formed on the valve stem I96, is an arm I91, pivotally connected to alonger link I 98. A more or less triangularly shaped plate I99, ispivotally mounted at I I9 to a boss III which extends forwardly from theforward end wall II2 of the flue 49.

It is understood that the wall I I2 serves as the end wall of the flue49 only in the region of the unit control valve, as shown in Fig. 2. Tothe right, beyond the temperature regulator the flue 49 extends fromfront wall 24 to rear wall 23 as previously described. Link I98 ispivotally connected at H3 to plate I 99, a second link Ill beinglikewise so connected thereto at II5. Numeral I I6 designates a rodconnected to link H4 at its upper end and is pivotally secured at itslower end in an upstanding ear or lug II I formed integral with a damperII 8, which extends from front to rear at the bottom of the burnerpocket 52. Rod H6 is mounted at the forward end of said damper H8, and acompanion rod I7, previously referred to, is pivotally secured to asimilar ear H9 at the rear end of damper I I8.

From this it is seen that movement of the handle 66, and thereby of thevalve stem I96, to the right (which allows gas to pass to the burner)raises the link I I4, rod II 6 and damper II8. At the same timeobviously, rod TI is raised thereby as previously explained, causingdamper plate 65 to uncover the opening 54. Turning handle 66 to theleft, shuts off the gas supply to the burner,

lowers the rods I I6 and I1, and thereby closes dampers H8 and 65, sothat the oven is ready for baking with coal.

Damper H8 governs the supply of secondary air admitted through anelongated rectangular opening I29 in the bottom I9 under the burner,Figs. 9 and 7. In order to further regulate the amount of air admittedthrough opening I20, an angle I2I is welded to the under side of damperH8. In the closed position of the damper H8, this angle extendsthroughthe opening I20, and has then no function. The downwardlyextending flange of the angle, however, has semi-circular cut outportions I22 as illustrated particularly in Fig. 14. It is obvious froman inspection of Fig. 9 that when damper H8 is but slightly raised onlya small amount of secondary air is admitted through the upper arc of thecut-out portions I22. It is also evident that when the damper H8 israised a greater distance, caused by feeding more gas to the burner, agreater amount of secondary air is admitted. The advantage of thearcuately cut out angle constructions I2I and I22, is that it allows theair to enter gradually and prevents a sudden inrush of air as wouldhappen without this arrangement.

Primarily air is admitted through a small opening I23, in the bottom I9,in front of the burner adjacent the front wall 24, Figs. 6 and '7.Numeral I24 designates a small damper pivoted in lugs I25, which liesover this opening and rests upon damper H8 as shown. Damper H8 ispivoted at I26 at the front and rear walls of the range, and the frontend thereof also partially covers the opening I23. The damper I24 restsby gravity upon damper H8, and both dampers operate in conjunction withone another. Therefore when the handle 65 is turned, raising or loweringdamper H8 as described, primary air damper I24 is also raised orlowered.

In the event a greater amount of primary air than is necessary for theeificient operation of the burner should be admitted such cold air wouldfind its way into and circulate in the oven tending to chill the oventemperature. To prevent this, a baffle plate I21, shown in Figs. 6 and13 is secured above the opening I23, to the wall 34 and the verticalleft wall of the flue This plate extends from the front wall 24rearwardly to approximately above the first burner orifice 96, andslightly above the burner. By this means, the excess primary air isdeflected over the burner flames, and is, therefore, heated beforefinding its way into the oven proper.

The forward end of the burner is supported by the pipe I05. Numeral I28designates a bracket, fixed to the rear wall 23, which bracket supportsthe rear end of the burner.

In Fig. 16 is illustrated the preferred construction of the lowerextremity of plate 80. As stated this extremity lies between the firstand second tubes of the burner and is preferably corrugated as atnumeral I29 so as to more certainly divide the secondary air equally oneither side thereof.

What I claim is:

1. In a combination gas and coal range, an oven, a burner, primary andsecondary air openings in the bottom of said range, dampers operativelypositioned over said primary and secondary air openings, the damper forthe primary air opening supported by and in frictional engagement withthe damper for the secondary air opening, so that the movement of thesecondary damper actuates the primary damper, a rod connected to saidsecondary damper at one end and to a link at its other end, atriangularly shaped I plate pivotally mounted to an end wall of saidoven, said link pivotally connected at its free end to said triangularlyshaped plate, a second link pivotally secured at one end to saidtriangularly shaped plate, a gas valve for the control of said burners,a valve stem operatively forming a part of said gas valve, an arm formedon said valve stem, the free end of said second link secured pivotallyto the free end of said arm so that a rotation of said valve stem willopen and close the dampers for the primary and secondary air openings.

2. In a combination gas and coal range, an oven, a burner, primary andsecondary air openings in the bottom of said range, dampers operativelypositioned over said primary and secondary air openings, the damper forthe primary air opening supported by and in frictional engagement withthe damper for the secondary air opening, so that the movement of thesecondary damper actuates the primary damper, a rod connected to saidsecondary damper at one end and to a link at its other end, atriangularly shaped plate pivotally mounted to an end wall of said oven,said link pivotally connected at its free end to said triangularlyshaped plate, a second link pivotally secured at one end to saidtriangularly shaped plate, a gas valve for the control of said burners,a valve stem operatively forming a part of said gas valve, an arm formedon said valve stem, the free end of said second link secured pivotallyto the free end of said arm so that a rotation of said valve stem willopen and close the dampers for the primary and secondary air openings,the side wall of said oven having a rectangular slot formed therein, alever pivotally secured to said side wall so that in the movement ofsaid lever it may be caused to open or close the rectangular slot in theside wall of said oven, a rocker arm pivotally secured to the rear wallof said oven and having its one end in operative frictional engagementwith the free end of said lever, a rod pivotally secured to the free endof said rocker arm, the opposite end of said rod secured to the damperoperatively positioned over the secondary air opening in the bottom ofsaid range, so that when said valve stem is actuated it will actuatesaid sliding plate over the rectangular slot in the side wall of saidoven, in addition to performing the previous functions.

3. In a combination gas and coal range, an oven, a burner, primary andsecondary air openings in the bottom of said range, dampers operativelypositioned over said primary and secondary air openings, the damper forthe primary air opening supported by and in frictional engagement withthe damper for the secondary air opening, so that the movement of thesecondary damper actuates the primary damper, a rod connected to saidsecondary damper at one end and to a link at its other end, atriangularly shaped plate pivotally mounted to an end wall of said oven,said link pivotally connected at its free end to said triangularlyshaped plate, a second link pivotally secured at one end to saidtriangularly shaped plate, a gas valve for the control of said burners,a valve stem operatively forming a part of said gas valve, an arm formedon said valve stem, the free end of said second link secured pivotallyto the free end of said arm so that a rotation of said valve stem willopen and close the dampers for the primary and secondary air openings,the side wall of said oven having a rectangular slot formed therein, alever pivotally secured to said side wall so that in the movement ofsaid lever it may be caused to open or close the rectangular slot in theside wall of said oven, a rocker arm pivotally secured to the rear wallof said oven and having its one end in operative frictional engagementwith the free end of said lever, a rod pivotally secured to the free endof said rocker arm, the opposite end of said rod secured to the damperoperatively positioned over the secondary air opening in the pottom ofsaid range so that when said valve stem is actuated it will actuate saidsliding plate over the rectangular slot in the side Wall of said oven,in addition to performing the previous functions, an angle 5 havingsemi-circular cut out portions in the lower vertical face secured to thedamper for said secondary opening.

WILLIAM A. BUSIEK.

